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// Other services

Port 1643: isis-ambc

Port 1643 is assigned by IANA to isis-ambc (isis-ambc).

1643

How isis-ambc works

Other services
client:1643isis-ambcresponse client:1643isis-ambcresponse

The client sends a request to port 1643 and the isis-ambc service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1643 dangerous?

We have no specific security note for port 1643. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1643

ServicePortTransportDescriptionReferenceUpdated
isis-ambc 1643 TCP, UDP isis-ambc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1643, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1643'      # process listening on 1643
sudo lsof -nP -i :1643

macOS

sudo lsof -nP -i :1643

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1643 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1643
netstat -ano | findstr :1643

From another machine

nmap -p 1643 -sV <host>
sudo nmap -sU -p 1643 <host>
nc -zv <host> 1643

Block it in the firewall

sudo ufw deny 1643/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1643" -Direction Inbound -LocalPort 1643 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1643 used for?

Port 1643 is assigned by IANA to isis-ambc (isis-ambc).

Is port 1643 TCP or UDP?

Port 1643 is registered for TCP and UDP.

Is it safe to open port 1643?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1643 is open?

On Linux run "ss -ltnup 'sport = :1643'", on macOS "lsof -nP -i :1643", and on Windows "netstat -ano | findstr :1643" to see the local process. From another machine, "nmap -p 1643 <host>" shows whether it is reachable.

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